The Tor Browser: gfx/skia/trunk/src/core/SkBlitter_RGB16.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkBlitter_RGB16.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkBlitter_RGB16.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkBlitRow.h"
 #include "SkCoreBlitters.h"
 #include "SkColorPriv.h"
 #include "SkDither.h"
 #include "SkShader.h"
 #include "SkUtils.h"
 #include "SkXfermode.h"
 #if defined(__ARM_HAVE_NEON) && defined(SK_CPU_LENDIAN)
     #define SK_USE_NEON
     #include <arm_neon.h>
 #else
     // if we don't have neon, then our black blitter is worth the extra code
     #define USE_BLACK_BLITTER
 #endif
 void sk_dither_memset16(uint16_t dst[], uint16_t value, uint16_t other,
                         int count) {
     if (count > 0) {
         // see if we need to write one short before we can cast to an 4byte ptr
         // (we do this subtract rather than (unsigned)dst so we don't get warnings
         //  on 64bit machines)
         if (((char*)dst - (char*)0) & 2) {
             *dst++ = value;
             count -= 1;
             SkTSwap(value, other);
         }
         // fast way to set [value,other] pairs
 #ifdef SK_CPU_BENDIAN
         sk_memset32((uint32_t*)dst, (value << 16) | other, count >> 1);
 #else
         sk_memset32((uint32_t*)dst, (other << 16) | value, count >> 1);
 #endif
         if (count & 1) {
             dst[count - 1] = value;
         }
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 class SkRGB16_Blitter : public SkRasterBlitter {
 public:
     SkRGB16_Blitter(const SkBitmap& device, const SkPaint& paint);
     virtual void blitH(int x, int y, int width);
     virtual void blitAntiH(int x, int y, const SkAlpha* antialias,
                            const int16_t* runs);
     virtual void blitV(int x, int y, int height, SkAlpha alpha);
     virtual void blitRect(int x, int y, int width, int height);
     virtual void blitMask(const SkMask&,
                           const SkIRect&);
     virtual const SkBitmap* justAnOpaqueColor(uint32_t*);
 protected:
     SkPMColor   fSrcColor32;
     uint32_t    fExpandedRaw16;
     unsigned    fScale;
     uint16_t    fColor16;       // already scaled by fScale
     uint16_t    fRawColor16;    // unscaled
     uint16_t    fRawDither16;   // unscaled
     SkBool8     fDoDither;
     // illegal
     SkRGB16_Blitter& operator=(const SkRGB16_Blitter&);
     typedef SkRasterBlitter INHERITED;
 };
 class SkRGB16_Opaque_Blitter : public SkRGB16_Blitter {
 public:
     SkRGB16_Opaque_Blitter(const SkBitmap& device, const SkPaint& paint);
     virtual void blitH(int x, int y, int width);
     virtual void blitAntiH(int x, int y, const SkAlpha* antialias,
                            const int16_t* runs);
     virtual void blitV(int x, int y, int height, SkAlpha alpha);
     virtual void blitRect(int x, int y, int width, int height);
     virtual void blitMask(const SkMask&,
                           const SkIRect&);
 private:
     typedef SkRGB16_Blitter INHERITED;
 };
 #ifdef USE_BLACK_BLITTER
 class SkRGB16_Black_Blitter : public SkRGB16_Opaque_Blitter {
 public:
     SkRGB16_Black_Blitter(const SkBitmap& device, const SkPaint& paint);
     virtual void blitMask(const SkMask&, const SkIRect&);
     virtual void blitAntiH(int x, int y, const SkAlpha* antialias,
                            const int16_t* runs);
 private:
     typedef SkRGB16_Opaque_Blitter INHERITED;
 };
 #endif
 class SkRGB16_Shader_Blitter : public SkShaderBlitter {
 public:
     SkRGB16_Shader_Blitter(const SkBitmap& device, const SkPaint& paint);
     virtual ~SkRGB16_Shader_Blitter();
     virtual void blitH(int x, int y, int width);
     virtual void blitAntiH(int x, int y, const SkAlpha* antialias,
                            const int16_t* runs);
     virtual void blitRect(int x, int y, int width, int height);
 protected:
     SkPMColor*      fBuffer;
     SkBlitRow::Proc fOpaqueProc;
     SkBlitRow::Proc fAlphaProc;
 private:
     // illegal
     SkRGB16_Shader_Blitter& operator=(const SkRGB16_Shader_Blitter&);
     typedef SkShaderBlitter INHERITED;
 };
 // used only if the shader can perform shadSpan16
 class SkRGB16_Shader16_Blitter : public SkRGB16_Shader_Blitter {
 public:
     SkRGB16_Shader16_Blitter(const SkBitmap& device, const SkPaint& paint);
     virtual void blitH(int x, int y, int width);
     virtual void blitAntiH(int x, int y, const SkAlpha* antialias,
                            const int16_t* runs);
     virtual void blitRect(int x, int y, int width, int height);
 private:
     typedef SkRGB16_Shader_Blitter INHERITED;
 };
 class SkRGB16_Shader_Xfermode_Blitter : public SkShaderBlitter {
 public:
     SkRGB16_Shader_Xfermode_Blitter(const SkBitmap& device, const SkPaint& paint);
     virtual ~SkRGB16_Shader_Xfermode_Blitter();
     virtual void blitH(int x, int y, int width);
     virtual void blitAntiH(int x, int y, const SkAlpha* antialias,
                            const int16_t* runs);
 private:
     SkXfermode* fXfermode;
     SkPMColor*  fBuffer;
     uint8_t*    fAAExpand;
     // illegal
     SkRGB16_Shader_Xfermode_Blitter& operator=(const SkRGB16_Shader_Xfermode_Blitter&);
     typedef SkShaderBlitter INHERITED;
 };
 ///////////////////////////////////////////////////////////////////////////////
 #ifdef USE_BLACK_BLITTER
 SkRGB16_Black_Blitter::SkRGB16_Black_Blitter(const SkBitmap& device, const SkPaint& paint)
     : INHERITED(device, paint) {
     SkASSERT(paint.getShader() == NULL);
     SkASSERT(paint.getColorFilter() == NULL);
     SkASSERT(paint.getXfermode() == NULL);
     SkASSERT(paint.getColor() == SK_ColorBLACK);
 }
 #if 1
 #define black_8_pixels(mask, dst)       \
     do {                                \
         if (mask & 0x80) dst[0] = 0;    \
         if (mask & 0x40) dst[1] = 0;    \
         if (mask & 0x20) dst[2] = 0;    \
         if (mask & 0x10) dst[3] = 0;    \
         if (mask & 0x08) dst[4] = 0;    \
         if (mask & 0x04) dst[5] = 0;    \
         if (mask & 0x02) dst[6] = 0;    \
         if (mask & 0x01) dst[7] = 0;    \
     } while (0)
 #else
 static inline black_8_pixels(U8CPU mask, uint16_t dst[])
 {
     if (mask & 0x80) dst[0] = 0;
     if (mask & 0x40) dst[1] = 0;
     if (mask & 0x20) dst[2] = 0;
     if (mask & 0x10) dst[3] = 0;
     if (mask & 0x08) dst[4] = 0;
     if (mask & 0x04) dst[5] = 0;
     if (mask & 0x02) dst[6] = 0;
     if (mask & 0x01) dst[7] = 0;
 }
 #endif
 #define SK_BLITBWMASK_NAME                  SkRGB16_Black_BlitBW
 #define SK_BLITBWMASK_ARGS
 #define SK_BLITBWMASK_BLIT8(mask, dst)      black_8_pixels(mask, dst)
 #define SK_BLITBWMASK_GETADDR               getAddr16
 #define SK_BLITBWMASK_DEVTYPE               uint16_t
 #include "SkBlitBWMaskTemplate.h"
 void SkRGB16_Black_Blitter::blitMask(const SkMask& mask,
                                      const SkIRect& clip) {
     if (mask.fFormat == SkMask::kBW_Format) {
         SkRGB16_Black_BlitBW(fDevice, mask, clip);
     } else {
         uint16_t* SK_RESTRICT device = fDevice.getAddr16(clip.fLeft, clip.fTop);
         const uint8_t* SK_RESTRICT alpha = mask.getAddr8(clip.fLeft, clip.fTop);
         unsigned width = clip.width();
         unsigned height = clip.height();
         size_t deviceRB = fDevice.rowBytes() - (width << 1);
         unsigned maskRB = mask.fRowBytes - width;
         SkASSERT((int)height > 0);
         SkASSERT((int)width > 0);
         SkASSERT((int)deviceRB >= 0);
         SkASSERT((int)maskRB >= 0);
         do {
             unsigned w = width;
             do {
                 unsigned aa = *alpha++;
                 *device = SkAlphaMulRGB16(*device, SkAlpha255To256(255 - aa));
                 device += 1;
             } while (--w != 0);
             device = (uint16_t*)((char*)device + deviceRB);
             alpha += maskRB;
         } while (--height != 0);
     }
 }
 void SkRGB16_Black_Blitter::blitAntiH(int x, int y,
                                       const SkAlpha* SK_RESTRICT antialias,
                                       const int16_t* SK_RESTRICT runs) {
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     for (;;) {
         int count = runs[0];
         SkASSERT(count >= 0);
         if (count <= 0) {
             return;
         }
         runs += count;
         unsigned aa = antialias[0];
         antialias += count;
         if (aa) {
             if (aa == 255) {
                 memset(device, 0, count << 1);
             } else {
                 aa = SkAlpha255To256(255 - aa);
                 do {
                     *device = SkAlphaMulRGB16(*device, aa);
                     device += 1;
                 } while (--count != 0);
                 continue;
             }
         }
         device += count;
     }
 }
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 SkRGB16_Opaque_Blitter::SkRGB16_Opaque_Blitter(const SkBitmap& device,
                                                const SkPaint& paint)
 : INHERITED(device, paint) {}
 void SkRGB16_Opaque_Blitter::blitH(int x, int y, int width) {
     SkASSERT(width > 0);
     SkASSERT(x + width <= fDevice.width());
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     uint16_t srcColor = fColor16;
     SkASSERT(fRawColor16 == srcColor);
     if (fDoDither) {
         uint16_t ditherColor = fRawDither16;
         if ((x ^ y) & 1) {
             SkTSwap(ditherColor, srcColor);
         }
         sk_dither_memset16(device, srcColor, ditherColor, width);
     } else {
         sk_memset16(device, srcColor, width);
     }
 }
 // return 1 or 0 from a bool
 static inline int Bool2Int(int value) {
     return !!value;
 }
 void SkRGB16_Opaque_Blitter::blitAntiH(int x, int y,
                                        const SkAlpha* SK_RESTRICT antialias,
                                        const int16_t* SK_RESTRICT runs) {
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     uint16_t    srcColor = fRawColor16;
     uint32_t    srcExpanded = fExpandedRaw16;
     int         ditherInt = Bool2Int(fDoDither);
     uint16_t    ditherColor = fRawDither16;
     // if we have no dithering, this will always fail
     if ((x ^ y) & ditherInt) {
         SkTSwap(ditherColor, srcColor);
     }
     for (;;) {
         int count = runs[0];
         SkASSERT(count >= 0);
         if (count <= 0) {
             return;
         }
         runs += count;
         unsigned aa = antialias[0];
         antialias += count;
         if (aa) {
             if (aa == 255) {
                 if (ditherInt) {
                     sk_dither_memset16(device, srcColor,
                                        ditherColor, count);
                 } else {
                     sk_memset16(device, srcColor, count);
                 }
             } else {
                 // TODO: respect fDoDither
                 unsigned scale5 = SkAlpha255To256(aa) >> 3;
                 uint32_t src32 = srcExpanded * scale5;
                 scale5 = 32 - scale5; // now we can use it on the device
                 int n = count;
                 do {
                     uint32_t dst32 = SkExpand_rgb_16(*device) * scale5;
                     *device++ = SkCompact_rgb_16((src32 + dst32) >> 5);
                 } while (--n != 0);
                 goto DONE;
             }
         }
         device += count;
     DONE:
         // if we have no dithering, this will always fail
         if (count & ditherInt) {
             SkTSwap(ditherColor, srcColor);
         }
     }
 }
 #define solid_8_pixels(mask, dst, color)    \
     do {                                    \
         if (mask & 0x80) dst[0] = color;    \
         if (mask & 0x40) dst[1] = color;    \
         if (mask & 0x20) dst[2] = color;    \
         if (mask & 0x10) dst[3] = color;    \
         if (mask & 0x08) dst[4] = color;    \
         if (mask & 0x04) dst[5] = color;    \
         if (mask & 0x02) dst[6] = color;    \
         if (mask & 0x01) dst[7] = color;    \
     } while (0)
 #define SK_BLITBWMASK_NAME                  SkRGB16_BlitBW
 #define SK_BLITBWMASK_ARGS                  , uint16_t color
 #define SK_BLITBWMASK_BLIT8(mask, dst)      solid_8_pixels(mask, dst, color)
 #define SK_BLITBWMASK_GETADDR               getAddr16
 #define SK_BLITBWMASK_DEVTYPE               uint16_t
 #include "SkBlitBWMaskTemplate.h"
 static U16CPU blend_compact(uint32_t src32, uint32_t dst32, unsigned scale5) {
     return SkCompact_rgb_16(dst32 + ((src32 - dst32) * scale5 >> 5));
 }
 void SkRGB16_Opaque_Blitter::blitMask(const SkMask& mask,
                                       const SkIRect& clip) {
     if (mask.fFormat == SkMask::kBW_Format) {
         SkRGB16_BlitBW(fDevice, mask, clip, fColor16);
         return;
     }
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(clip.fLeft, clip.fTop);
     const uint8_t* SK_RESTRICT alpha = mask.getAddr8(clip.fLeft, clip.fTop);
     int width = clip.width();
     int height = clip.height();
     size_t      deviceRB = fDevice.rowBytes() - (width << 1);
     unsigned    maskRB = mask.fRowBytes - width;
     uint32_t    expanded32 = fExpandedRaw16;
 #ifdef SK_USE_NEON
 #define    UNROLL    8
     do {
         int w = width;
         if (w >= UNROLL) {
             uint32x4_t color, dev_lo, dev_hi;
             uint32x4_t wn1, wn2, tmp;
             uint32x4_t vmask_g16, vmask_ng16;
             uint16x8_t valpha, vdev;
             uint16x4_t odev_lo, odev_hi, valpha_lo, valpha_hi;
             // prepare constants
             vmask_g16 = vdupq_n_u32(SK_G16_MASK_IN_PLACE);
             vmask_ng16 = vdupq_n_u32(~SK_G16_MASK_IN_PLACE);
             color = vdupq_n_u32(expanded32);
             do {
                 // alpha is 8x8, widen and split to get a pair of 16x4
                 valpha = vaddw_u8(vdupq_n_u16(1), vld1_u8(alpha));
                 valpha = vshrq_n_u16(valpha, 3);
                 valpha_lo = vget_low_u16(valpha);
                 valpha_hi = vget_high_u16(valpha);
                 // load pixels
                 vdev = vld1q_u16(device);
                 dev_lo = vmovl_u16(vget_low_u16(vdev));
                 dev_hi = vmovl_u16(vget_high_u16(vdev));
                 // unpack them in 32 bits
                 dev_lo = (dev_lo & vmask_ng16) | vshlq_n_u32(dev_lo & vmask_g16, 16);
                 dev_hi = (dev_hi & vmask_ng16) | vshlq_n_u32(dev_hi & vmask_g16, 16);
                 // blend with color
                 tmp = (color - dev_lo) * vmovl_u16(valpha_lo);
                 tmp = vshrq_n_u32(tmp, 5);
                 dev_lo += tmp;
                 tmp = vmulq_u32(color - dev_hi, vmovl_u16(valpha_hi));
                 tmp = vshrq_n_u32(tmp, 5);
                 dev_hi += tmp;
                 // re-compact
                 wn1 = dev_lo & vmask_ng16;
                 wn2 = vshrq_n_u32(dev_lo, 16) & vmask_g16;
                 odev_lo = vmovn_u32(wn1 | wn2);
                 wn1 = dev_hi & vmask_ng16;
                 wn2 = vshrq_n_u32(dev_hi, 16) & vmask_g16;
                 odev_hi = vmovn_u32(wn1 | wn2);
                 // store
                 vst1q_u16(device, vcombine_u16(odev_lo, odev_hi));
                 device += UNROLL;
                 alpha += UNROLL;
                 w -= UNROLL;
             } while (w >= UNROLL);
         }
         // residuals
         while (w > 0) {
             *device = blend_compact(expanded32, SkExpand_rgb_16(*device),
                                     SkAlpha255To256(*alpha++) >> 3);
             device += 1;
             --w;
         }
         device = (uint16_t*)((char*)device + deviceRB);
         alpha += maskRB;
     } while (--height != 0);
 #undef    UNROLL
 #else   // non-neon code
     do {
         int w = width;
         do {
             *device = blend_compact(expanded32, SkExpand_rgb_16(*device),
                                     SkAlpha255To256(*alpha++) >> 3);
             device += 1;
         } while (--w != 0);
         device = (uint16_t*)((char*)device + deviceRB);
         alpha += maskRB;
     } while (--height != 0);
 #endif
 }
 void SkRGB16_Opaque_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     size_t    deviceRB = fDevice.rowBytes();
     // TODO: respect fDoDither
     unsigned scale5 = SkAlpha255To256(alpha) >> 3;
     uint32_t src32 =  fExpandedRaw16 * scale5;
     scale5 = 32 - scale5;
     do {
         uint32_t dst32 = SkExpand_rgb_16(*device) * scale5;
         *device = SkCompact_rgb_16((src32 + dst32) >> 5);
         device = (uint16_t*)((char*)device + deviceRB);
     } while (--height != 0);
 }
 void SkRGB16_Opaque_Blitter::blitRect(int x, int y, int width, int height) {
     SkASSERT(x + width <= fDevice.width() && y + height <= fDevice.height());
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     size_t      deviceRB = fDevice.rowBytes();
     uint16_t    color16 = fColor16;
     if (fDoDither) {
         uint16_t ditherColor = fRawDither16;
         if ((x ^ y) & 1) {
             SkTSwap(ditherColor, color16);
         }
         while (--height >= 0) {
             sk_dither_memset16(device, color16, ditherColor, width);
             SkTSwap(ditherColor, color16);
             device = (uint16_t*)((char*)device + deviceRB);
         }
     } else {  // no dither
         while (--height >= 0) {
             sk_memset16(device, color16, width);
             device = (uint16_t*)((char*)device + deviceRB);
         }
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 SkRGB16_Blitter::SkRGB16_Blitter(const SkBitmap& device, const SkPaint& paint)
     : INHERITED(device) {
     SkColor color = paint.getColor();
     fSrcColor32 = SkPreMultiplyColor(color);
     fScale = SkAlpha255To256(SkColorGetA(color));
     int r = SkColorGetR(color);
     int g = SkColorGetG(color);
     int b = SkColorGetB(color);
     fRawColor16 = fRawDither16 = SkPack888ToRGB16(r, g, b);
     // if we're dithered, use fRawDither16 to hold that.
     if ((fDoDither = paint.isDither()) != false) {
         fRawDither16 = SkDitherPack888ToRGB16(r, g, b);
     }
     fExpandedRaw16 = SkExpand_rgb_16(fRawColor16);
     fColor16 = SkPackRGB16( SkAlphaMul(r, fScale) >> (8 - SK_R16_BITS),
                             SkAlphaMul(g, fScale) >> (8 - SK_G16_BITS),
                             SkAlphaMul(b, fScale) >> (8 - SK_B16_BITS));
 }
 const SkBitmap* SkRGB16_Blitter::justAnOpaqueColor(uint32_t* value) {
     if (!fDoDither && 256 == fScale) {
         *value = fRawColor16;
         return &fDevice;
     }
     return NULL;
 }
 static uint32_t pmcolor_to_expand16(SkPMColor c) {
     unsigned r = SkGetPackedR32(c);
     unsigned g = SkGetPackedG32(c);
     unsigned b = SkGetPackedB32(c);
     return (g << 24) | (r << 13) | (b << 2);
 }
 static inline void blend32_16_row(SkPMColor src, uint16_t dst[], int count) {
     SkASSERT(count > 0);
     uint32_t src_expand = pmcolor_to_expand16(src);
     unsigned scale = SkAlpha255To256(0xFF - SkGetPackedA32(src)) >> 3;
     do {
         uint32_t dst_expand = SkExpand_rgb_16(*dst) * scale;
         *dst = SkCompact_rgb_16((src_expand + dst_expand) >> 5);
         dst += 1;
     } while (--count != 0);
 }
 void SkRGB16_Blitter::blitH(int x, int y, int width) {
     SkASSERT(width > 0);
     SkASSERT(x + width <= fDevice.width());
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     // TODO: respect fDoDither
     blend32_16_row(fSrcColor32, device, width);
 }
 void SkRGB16_Blitter::blitAntiH(int x, int y,
                                 const SkAlpha* SK_RESTRICT antialias,
                                 const int16_t* SK_RESTRICT runs) {
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     uint32_t    srcExpanded = fExpandedRaw16;
     unsigned    scale = fScale;
     // TODO: respect fDoDither
     for (;;) {
         int count = runs[0];
         SkASSERT(count >= 0);
         if (count <= 0) {
             return;
         }
         runs += count;
         unsigned aa = antialias[0];
         antialias += count;
         if (aa) {
             unsigned scale5 = SkAlpha255To256(aa) * scale >> (8 + 3);
             uint32_t src32 =  srcExpanded * scale5;
             scale5 = 32 - scale5;
             do {
                 uint32_t dst32 = SkExpand_rgb_16(*device) * scale5;
                 *device++ = SkCompact_rgb_16((src32 + dst32) >> 5);
             } while (--count != 0);
             continue;
         }
         device += count;
     }
 }
 static inline void blend_8_pixels(U8CPU bw, uint16_t dst[], unsigned dst_scale,
                                   U16CPU srcColor) {
     if (bw & 0x80) dst[0] = srcColor + SkAlphaMulRGB16(dst[0], dst_scale);
     if (bw & 0x40) dst[1] = srcColor + SkAlphaMulRGB16(dst[1], dst_scale);
     if (bw & 0x20) dst[2] = srcColor + SkAlphaMulRGB16(dst[2], dst_scale);
     if (bw & 0x10) dst[3] = srcColor + SkAlphaMulRGB16(dst[3], dst_scale);
     if (bw & 0x08) dst[4] = srcColor + SkAlphaMulRGB16(dst[4], dst_scale);
     if (bw & 0x04) dst[5] = srcColor + SkAlphaMulRGB16(dst[5], dst_scale);
     if (bw & 0x02) dst[6] = srcColor + SkAlphaMulRGB16(dst[6], dst_scale);
     if (bw & 0x01) dst[7] = srcColor + SkAlphaMulRGB16(dst[7], dst_scale);
 }
 #define SK_BLITBWMASK_NAME                  SkRGB16_BlendBW
 #define SK_BLITBWMASK_ARGS                  , unsigned dst_scale, U16CPU src_color
 #define SK_BLITBWMASK_BLIT8(mask, dst)      blend_8_pixels(mask, dst, dst_scale, src_color)
 #define SK_BLITBWMASK_GETADDR               getAddr16
 #define SK_BLITBWMASK_DEVTYPE               uint16_t
 #include "SkBlitBWMaskTemplate.h"
 void SkRGB16_Blitter::blitMask(const SkMask& mask,
                                const SkIRect& clip) {
     if (mask.fFormat == SkMask::kBW_Format) {
         SkRGB16_BlendBW(fDevice, mask, clip, 256 - fScale, fColor16);
         return;
     }
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(clip.fLeft, clip.fTop);
     const uint8_t* SK_RESTRICT alpha = mask.getAddr8(clip.fLeft, clip.fTop);
     int width = clip.width();
     int height = clip.height();
     size_t      deviceRB = fDevice.rowBytes() - (width << 1);
     unsigned    maskRB = mask.fRowBytes - width;
     uint32_t    color32 = fExpandedRaw16;
     unsigned scale256 = fScale;
     do {
         int w = width;
         do {
             unsigned aa = *alpha++;
             unsigned scale = SkAlpha255To256(aa) * scale256 >> (8 + 3);
             uint32_t src32 = color32 * scale;
             uint32_t dst32 = SkExpand_rgb_16(*device) * (32 - scale);
             *device++ = SkCompact_rgb_16((src32 + dst32) >> 5);
         } while (--w != 0);
         device = (uint16_t*)((char*)device + deviceRB);
         alpha += maskRB;
     } while (--height != 0);
 }
 void SkRGB16_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     size_t    deviceRB = fDevice.rowBytes();
     // TODO: respect fDoDither
     unsigned scale5 = SkAlpha255To256(alpha) * fScale >> (8 + 3);
     uint32_t src32 =  fExpandedRaw16 * scale5;
     scale5 = 32 - scale5;
     do {
         uint32_t dst32 = SkExpand_rgb_16(*device) * scale5;
         *device = SkCompact_rgb_16((src32 + dst32) >> 5);
         device = (uint16_t*)((char*)device + deviceRB);
     } while (--height != 0);
 }
 void SkRGB16_Blitter::blitRect(int x, int y, int width, int height) {
     SkASSERT(x + width <= fDevice.width() && y + height <= fDevice.height());
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     size_t    deviceRB = fDevice.rowBytes();
     SkPMColor src32 = fSrcColor32;
     while (--height >= 0) {
         blend32_16_row(src32, device, width);
         device = (uint16_t*)((char*)device + deviceRB);
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 SkRGB16_Shader16_Blitter::SkRGB16_Shader16_Blitter(const SkBitmap& device,
                                                    const SkPaint& paint)
     : SkRGB16_Shader_Blitter(device, paint) {
     SkASSERT(SkShader::CanCallShadeSpan16(fShaderFlags));
 }
 void SkRGB16_Shader16_Blitter::blitH(int x, int y, int width) {
     SkASSERT(x + width <= fDevice.width());
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     SkShader*   shader = fShader;
     int alpha = shader->getSpan16Alpha();
     if (0xFF == alpha) {
         shader->shadeSpan16(x, y, device, width);
     } else {
         uint16_t* span16 = (uint16_t*)fBuffer;
         shader->shadeSpan16(x, y, span16, width);
         SkBlendRGB16(span16, device, SkAlpha255To256(alpha), width);
     }
 }
 void SkRGB16_Shader16_Blitter::blitRect(int x, int y, int width, int height) {
     SkShader*   shader = fShader;
     uint16_t*   dst = fDevice.getAddr16(x, y);
     size_t      dstRB = fDevice.rowBytes();
     int         alpha = shader->getSpan16Alpha();
     if (0xFF == alpha) {
         if (fShaderFlags & SkShader::kConstInY16_Flag) {
             // have the shader blit directly into the device the first time
             shader->shadeSpan16(x, y, dst, width);
             // and now just memcpy that line on the subsequent lines
             if (--height > 0) {
                 const uint16_t* orig = dst;
                 do {
                     dst = (uint16_t*)((char*)dst + dstRB);
                     memcpy(dst, orig, width << 1);
                 } while (--height);
             }
         } else {    // need to call shadeSpan16 for every line
             do {
                 shader->shadeSpan16(x, y, dst, width);
                 y += 1;
                 dst = (uint16_t*)((char*)dst + dstRB);
             } while (--height);
         }
     } else {
         int scale = SkAlpha255To256(alpha);
         uint16_t* span16 = (uint16_t*)fBuffer;
         if (fShaderFlags & SkShader::kConstInY16_Flag) {
             shader->shadeSpan16(x, y, span16, width);
             do {
                 SkBlendRGB16(span16, dst, scale, width);
                 dst = (uint16_t*)((char*)dst + dstRB);
             } while (--height);
         } else {
             do {
                 shader->shadeSpan16(x, y, span16, width);
                 SkBlendRGB16(span16, dst, scale, width);
                 y += 1;
                 dst = (uint16_t*)((char*)dst + dstRB);
             } while (--height);
         }
     }
 }
 void SkRGB16_Shader16_Blitter::blitAntiH(int x, int y,
                                          const SkAlpha* SK_RESTRICT antialias,
                                          const int16_t* SK_RESTRICT runs) {
     SkShader*   shader = fShader;
     SkPMColor* SK_RESTRICT span = fBuffer;
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     int alpha = shader->getSpan16Alpha();
     uint16_t* span16 = (uint16_t*)span;
     if (0xFF == alpha) {
         for (;;) {
             int count = *runs;
             if (count <= 0) {
                 break;
             }
             SkASSERT(count <= fDevice.width()); // don't overrun fBuffer
             int aa = *antialias;
             if (aa == 255) {
                 // go direct to the device!
                 shader->shadeSpan16(x, y, device, count);
             } else if (aa) {
                 shader->shadeSpan16(x, y, span16, count);
                 SkBlendRGB16(span16, device, SkAlpha255To256(aa), count);
             }
             device += count;
             runs += count;
             antialias += count;
             x += count;
         }
     } else {  // span alpha is < 255
         alpha = SkAlpha255To256(alpha);
         for (;;) {
             int count = *runs;
             if (count <= 0) {
                 break;
             }
             SkASSERT(count <= fDevice.width()); // don't overrun fBuffer
             int aa = SkAlphaMul(*antialias, alpha);
             if (aa) {
                 shader->shadeSpan16(x, y, span16, count);
                 SkBlendRGB16(span16, device, SkAlpha255To256(aa), count);
             }
             device += count;
             runs += count;
             antialias += count;
             x += count;
         }
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 SkRGB16_Shader_Blitter::SkRGB16_Shader_Blitter(const SkBitmap& device,
                                                const SkPaint& paint)
 : INHERITED(device, paint) {
     SkASSERT(paint.getXfermode() == NULL);
     fBuffer = (SkPMColor*)sk_malloc_throw(device.width() * sizeof(SkPMColor));
     // compute SkBlitRow::Procs
     unsigned flags = 0;
     uint32_t shaderFlags = fShaderFlags;
     // shaders take care of global alpha, so we never set it in SkBlitRow
     if (!(shaderFlags & SkShader::kOpaqueAlpha_Flag)) {
         flags |= SkBlitRow::kSrcPixelAlpha_Flag;
     }
     // don't dither if the shader is really 16bit
     if (paint.isDither() && !(shaderFlags & SkShader::kIntrinsicly16_Flag)) {
         flags |= SkBlitRow::kDither_Flag;
     }
     // used when we know our global alpha is 0xFF
     fOpaqueProc = SkBlitRow::Factory(flags, SkBitmap::kRGB_565_Config);
     // used when we know our global alpha is < 0xFF
     fAlphaProc  = SkBlitRow::Factory(flags | SkBlitRow::kGlobalAlpha_Flag,
                                      SkBitmap::kRGB_565_Config);
 }
 SkRGB16_Shader_Blitter::~SkRGB16_Shader_Blitter() {
     sk_free(fBuffer);
 }
 void SkRGB16_Shader_Blitter::blitH(int x, int y, int width) {
     SkASSERT(x + width <= fDevice.width());
     fShader->shadeSpan(x, y, fBuffer, width);
     // shaders take care of global alpha, so we pass 0xFF (should be ignored)
     fOpaqueProc(fDevice.getAddr16(x, y), fBuffer, width, 0xFF, x, y);
 }
 void SkRGB16_Shader_Blitter::blitRect(int x, int y, int width, int height) {
     SkShader*       shader = fShader;
     SkBlitRow::Proc proc = fOpaqueProc;
     SkPMColor*      buffer = fBuffer;
     uint16_t*       dst = fDevice.getAddr16(x, y);
     size_t          dstRB = fDevice.rowBytes();
     if (fShaderFlags & SkShader::kConstInY32_Flag) {
         shader->shadeSpan(x, y, buffer, width);
         do {
             proc(dst, buffer, width, 0xFF, x, y);
             y += 1;
             dst = (uint16_t*)((char*)dst + dstRB);
         } while (--height);
     } else {
         do {
             shader->shadeSpan(x, y, buffer, width);
             proc(dst, buffer, width, 0xFF, x, y);
             y += 1;
             dst = (uint16_t*)((char*)dst + dstRB);
         } while (--height);
     }
 }
 static inline int count_nonzero_span(const int16_t runs[], const SkAlpha aa[]) {
     int count = 0;
     for (;;) {
         int n = *runs;
         if (n == 0 || *aa == 0) {
             break;
         }
         runs += n;
         aa += n;
         count += n;
     }
     return count;
 }
 void SkRGB16_Shader_Blitter::blitAntiH(int x, int y,
                                        const SkAlpha* SK_RESTRICT antialias,
                                        const int16_t* SK_RESTRICT runs) {
     SkShader*   shader = fShader;
     SkPMColor* SK_RESTRICT span = fBuffer;
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     for (;;) {
         int count = *runs;
         if (count <= 0) {
             break;
         }
         int aa = *antialias;
         if (0 == aa) {
             device += count;
             runs += count;
             antialias += count;
             x += count;
             continue;
         }
         int nonZeroCount = count + count_nonzero_span(runs + count, antialias + count);
         SkASSERT(nonZeroCount <= fDevice.width()); // don't overrun fBuffer
         shader->shadeSpan(x, y, span, nonZeroCount);
         SkPMColor* localSpan = span;
         for (;;) {
             SkBlitRow::Proc proc = (aa == 0xFF) ? fOpaqueProc : fAlphaProc;
             proc(device, localSpan, count, aa, x, y);
             x += count;
             device += count;
             runs += count;
             antialias += count;
             nonZeroCount -= count;
             if (nonZeroCount == 0) {
                 break;
             }
             localSpan += count;
             SkASSERT(nonZeroCount > 0);
             count = *runs;
             SkASSERT(count > 0);
             aa = *antialias;
         }
     }
 }
 ///////////////////////////////////////////////////////////////////////
 SkRGB16_Shader_Xfermode_Blitter::SkRGB16_Shader_Xfermode_Blitter(
                                 const SkBitmap& device, const SkPaint& paint)
 : INHERITED(device, paint) {
     fXfermode = paint.getXfermode();
     SkASSERT(fXfermode);
     fXfermode->ref();
     int width = device.width();
     fBuffer = (SkPMColor*)sk_malloc_throw((width + (SkAlign4(width) >> 2)) * sizeof(SkPMColor));
     fAAExpand = (uint8_t*)(fBuffer + width);
 }
 SkRGB16_Shader_Xfermode_Blitter::~SkRGB16_Shader_Xfermode_Blitter() {
     fXfermode->unref();
     sk_free(fBuffer);
 }
 void SkRGB16_Shader_Xfermode_Blitter::blitH(int x, int y, int width) {
     SkASSERT(x + width <= fDevice.width());
     uint16_t*   device = fDevice.getAddr16(x, y);
     SkPMColor*  span = fBuffer;
     fShader->shadeSpan(x, y, span, width);
     fXfermode->xfer16(device, span, width, NULL);
 }
 void SkRGB16_Shader_Xfermode_Blitter::blitAntiH(int x, int y,
                                 const SkAlpha* SK_RESTRICT antialias,
                                 const int16_t* SK_RESTRICT runs) {
     SkShader*   shader = fShader;
     SkXfermode* mode = fXfermode;
     SkPMColor* SK_RESTRICT span = fBuffer;
     uint8_t* SK_RESTRICT aaExpand = fAAExpand;
     uint16_t* SK_RESTRICT device = fDevice.getAddr16(x, y);
     for (;;) {
         int count = *runs;
         if (count <= 0) {
             break;
         }
         int aa = *antialias;
         if (0 == aa) {
             device += count;
             runs += count;
             antialias += count;
             x += count;
             continue;
         }
         int nonZeroCount = count + count_nonzero_span(runs + count,
                                                       antialias + count);
         SkASSERT(nonZeroCount <= fDevice.width()); // don't overrun fBuffer
         shader->shadeSpan(x, y, span, nonZeroCount);
         x += nonZeroCount;
         SkPMColor* localSpan = span;
         for (;;) {
             if (aa == 0xFF) {
                 mode->xfer16(device, localSpan, count, NULL);
             } else {
                 SkASSERT(aa);
                 memset(aaExpand, aa, count);
                 mode->xfer16(device, localSpan, count, aaExpand);
             }
             device += count;
             runs += count;
             antialias += count;
             nonZeroCount -= count;
             if (nonZeroCount == 0) {
                 break;
             }
             localSpan += count;
             SkASSERT(nonZeroCount > 0);
             count = *runs;
             SkASSERT(count > 0);
             aa = *antialias;
         }
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 SkBlitter* SkBlitter_ChooseD565(const SkBitmap& device, const SkPaint& paint,
         SkTBlitterAllocator* allocator) {
     SkASSERT(allocator != NULL);
     SkBlitter* blitter;
     SkShader* shader = paint.getShader();
     SkXfermode* mode = paint.getXfermode();
     // we require a shader if there is an xfermode, handled by our caller
     SkASSERT(NULL == mode || NULL != shader);
     if (shader) {
         if (mode) {
             blitter = allocator->createT<SkRGB16_Shader_Xfermode_Blitter>(device, paint);
         } else if (shader->canCallShadeSpan16()) {
             blitter = allocator->createT<SkRGB16_Shader16_Blitter>(device, paint);
         } else {
             blitter = allocator->createT<SkRGB16_Shader_Blitter>(device, paint);
         }
     } else {
         // no shader, no xfermode, (and we always ignore colorfilter)
         SkColor color = paint.getColor();
         if (0 == SkColorGetA(color)) {
             blitter = allocator->createT<SkNullBlitter>();
 #ifdef USE_BLACK_BLITTER
         } else if (SK_ColorBLACK == color) {
             blitter = allocator->createT<SkRGB16_Black_Blitter>(device, paint);
 #endif
         } else if (0xFF == SkColorGetA(color)) {
             blitter = allocator->createT<SkRGB16_Opaque_Blitter>(device, paint);
         } else {
             blitter = allocator->createT<SkRGB16_Blitter>(device, paint);
         }
     }
     return blitter;
 }

The Tor Browser / annotate

gfx/skia/trunk/src/core/SkBlitter_RGB16.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkBlitter_RGB16.cpp